:10
:09
:08
:07
:06
:05
:04
:03
:02
:01
| the offspring of a zebra and a donkey. |
| a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question. |
viaduct
type of long bridge or series of bridges, usually supported by a series of arches or on spans between tall towers. The purpose of a viaduct is to carry a road or railway over water, a valley, or another road. The viaduct is both functionally and etymologically related to the aqueduct, which carries water; both were developed by Roman engineers.
Learn more about viaduct with a free trial on Britannica.com.